Straight-edge and holder.



v T. IWANAMI. STRAIGHT EDGE AND HOLDER. A PPLIUATION HLBD Nov. 4, 1901,

9'?"5 ,'956.nv 1 Patented Nov.15,=191o.

J8 @Mm www UNITED STATES Para rr orne.

TAKAO IWANAMI, 0F WASHINGTON, DISTRICT 0F COLUMBIA.

ASTRAYI(frf:1'J.-2EDGE AND HOLDER.

Specification o'f Letters Patent. Patented Nov. 15, 1910.

Application led November 4, 1907. Serial No. 400,632.

To all whom it may concern: l Be it known that I, 'laliao IWANAMI, asubject of the Emperor-of- Japan,and resident of lvzlshiugton, in theDistrict of Columbialhave invented certain new and useful Improvementslin Straight-Edges and lIo'lders, of'whieh the Jfollowing is aspecilication.

This invention relatesv to an improvement in straight edge and holderforuse in connection with drawing boards and the object of the inventionis to produce a ruling device capable of use on large boards and yetpermit of easy adjustment and at the same time be sustained on oppositesides of the board so as to relieve the draftsman of all care inconnection with the support of the device.

In its preferable embodiment the straight edge is formed in the shape ofa T-square with anti-friction rollers arranged at the head of the squareadapted to contact with a straight edge on the drawing board while, atthe other end of the blade there is a mov able or shiftable carriageprovided with rollers which are adapted to cooperate with a track formedon or connected to the board. With this general statement my inventionmay be said to consist of the device as illustrated in the form in whichI now prefer to make it in the accompanying drawings and as hereinafterdescribed and claimed.

In the drawings accompanying and forming part hereof: Figure 1 is an endview of a drawing boardD having lmy invention supported thereon. Fig. 2is a bottom plan of a drawing board having my device supported thereon.Fig. 3 is a cross-section through the line 3, 3 of Fig. 2. Fig. .4 isan.

inverted view.

Referring to the details of the drawings by numerals: 1 designates anordinary drawing board having a true straight edge 2 on one side thereofand at the other side there may be supported any form of track 3. Thistrack, however, is not essential since it may be omitted if desired, orit may be formed directly on the board; but I prefer a'track supportedon its sides at 4, 4, as shown inV Fig. 2, for reasons which will behereinafter stated.

The straight edge may be', as illustrated in Figs. 1 and 2, 'a T-squarecomprising the ordinary blade 5 and the T-head 7, the latter beingprovided with anti-friction rollers-8 which are adapted to contact withvthe straight edge2 of the board as clearly shown in Flgs. 1 and 2. Thefree end of the blade 5 has connected to it, as illustrated in Figs.

.being suc 1 that when the clamping screws 18 are turned in onedirection they clamp the blade 5 between the plate 16 and the lowermember of the hanger 9, whereas when the clamping screws 18 are turnedin the oppositedirection the plate 1G is released so tiat the hanger 9may be moved or adjusted on the blade 5 with respect to the board 1.

The downward extension 12 which has been referred to is for the purposeof supporting the grooved rollers 20 which coact with the rail 3 tosupport the-free end of the blade 5, and to this end a bolt or pin 22has its end projecting through an opening in the end of the downwardextension 12 and the end of this bolt or pin is provided with an;aadjusting screw 24. At the oppo site end the bolt or pin is providedwith a perforated, flattened portion 22a on opposite sides of which areconnected plates 26.

and 28 by means of a pin 30. These two plates support, at opposite endsthereof, the rollers 20 on journals 31. A spring 34 is located aroundsaid pin 30 and acts between the downward extension 12 and a plate 35and normally tends to press the rollers 2O away from the downwardextension 12 and. thus keep them in contact with their rail or track 3.The plates 26 and 28 are loosely supported on the flattened end 22El ofthe pin 22 and thus are permitted to partake of a slight pivotalmovement should there be any irregularities or dents on the rail ortrack 3, and in order to form a guide, I form two ribs 38 on the bottomof support 10, in which projects the head of the aforesaid pin 30.

The rail or track 3 which has been before described is purposelysupported at its ends only by countersunk screws 4, in such a manner asto leave a space between almost the entire rail and the edge of `theboard to which it is secured. This space is for the purpose ofpermitting the paper of large drawings to be slipped down between theedge ol the board and the rail 3. To .support the rail at its center andyet permit of the paper being slipped down as just described, l connectto the rail 3 a roller 42 which is journaled on a support 44, and itwill be understood that while this roller 42 supports the rail 3 at thecenter, the rail is sui'liciently spring to permit of its being sprungoutward slightly so that the roller 42 will move with it suiiieiently toslip the end oi the drawing paper down between it and the end of theboard.

It will be evident that instead of using an ordinary T-square, anordinary straight edge may be used, and that it may be supported at eachend by means of my support and carriage.

What I claim as my invention is 1. In a device of the characterdescribed, a holder for a straight edge comprising means for supportingthe straight edge and a carriage adapted to contact with an edfe of aboard, said carriage being pivotaly suppo-rted with respect to saidholder thereby permitting it to take up any inequalities in the edge ofthe board, substantially as described.

2. In a device of the character described, a holder for a straight edgecomprising means for supporting the straight edge, and a carriagecoacting therewith and adapted to contact with an edge of a board, saidcarriage having a sprin actuated ivotal connection with the lio derpermitting it to yield in the event of ine ualities 'in the board,substantially as described.

3. In a device of the character described, a holder for a straight edgecomprising means for adjustably connecting it to a straight edge and aspring actuated carriage eoacting therewith and having rollers spacedsome distance apart and adapted to Contact with an edge of a board, saidspring and said rollers being in substantially the same planesubstantially as described.

4. In a device of the character described, a vholder for a straight edgecomprising means for supporting the straight edge and a spring actuatedcarriage coacting therewith and having` rollers adapted to contact withan edge of a board, said-rollers and their carriage having a yieldingand pivotal movement to take up any inequalities in the boardsubstantially as described. g

5. 1in a device of the character described,

a straight edge, means at onel end "of'the straight edge for coactingwith a drawing board, and a holder at the opposite end of the straightedge provided with means for adjustably connecting it with said straight.thereof, a straight edge coacting with said board and having means forcoacting with one edge of the board and a holder for coacting with thevedge provided with the track, said holder having means for adjustablyconnecting with the straight edge and a spring actuated cariiagecoacting with said means and carrying rollers adaptedto run on saidtrack, said rollers, said track and said spring all being locatedunderneath said liolderand all being substantially in the same planesubstantially as described.

7. In a devicevof the character described, a board having a track orrail at one side thereof, said track being'supported at the ends andhaving a space of the full depth of the track between the track and theboai'd proper for the passage of paper, in combination with a straightedge, means for supporting said straight edge and a spring actuatedcarriage coacting with said means and having rollers adapted to contactwith said track, substantially as described.

8. In a device of the character described, a board having a track orrail at one side thereof, said track being supported at the ends andhaving a space of the full depth of the track between the track and theboard proper for the passage of paper, and said track carryin supportingmeans near its center, in com ination with a straight edge, means forsupporting said straight edge and a spring actuated carriage coactingwith said means and having rollers adapted to contact with said track,substantially as described.

9. In a device of the character described, an attachment comprisingmeans for clamping it to a straight edge and a spring supported carriagecarrying rollers spaced some distance apart and adapted to contact withan edge of a board, said spring and said rollers being in substantiallythe same plane substantially as described.

10. In a device of the character described, an attachment comprising aholder, means for clamping it to a straight edge, and a spring supportedcarriage carrying rollers adapted to contact with an edge of a board,said rollers being in substantially the same plane with said spring andfree to move to take up inequalities' of the board, substanfor clampinga straightl edge, asupport projectingtromsaid means, and a springsupstrasse ported carriage carried by said support, said carriage havingrollers said spring and said rollers being in substantially the sameplane With each other and below the blade supporting means adapted tocontact with an edge of a board, substantially as described.

12. In a device of the character described, an attachment comprising aholder, means for clamping it to a straight edge, and a spring supportedcarriage carrying rollers adapted to contact with an edge of a board,said carriage and its rollers having pivotal movement to take up anyinequalities in a board, substantially as described.

13. In a device of the character described, an attachment comprisingmeans for clamping it to a board, and a carriage comprising a springsupported bolt or pin, plates pivotally connected with said bolt or pinand rollers carried by said plates, said pivotal connection permittingthe rollers to take up any inequalities, substantially asdescribed.

14. In a device of the character described, an attachment having arecess for receiving a straight edge, means for clamping a straight edgein said recess, a support projecting from said attachment, a bolt or pincarried by said support, plates connected With said bolt or pin, androllers carried by said plates, substantially as described.

15. In a device of the character described, an attachment having arecess for receiving a straight edge, means for l clamping a straightedge in said recess, support projecting from said attachment, a bolt orpin carried by said support, plates connected With said bolt or pin,rollers carried by said plates, and a spring coacting with said platesand rollers, the tension of said spring being adjustable substantiallyas described.

16. In a device of the character described, an attachment comprising asupport having a recess adapted to receive a straight edge, a plate insaid recess, clamping screws causing said plate to clamp a straightedge, a bolt or pin projecting from said support, plates pivoted to saidbolt vor pin, rollers carried by said plates, and a spring around saidbolt or pin coactlng With said plates and rollers, substantially asdescribed.

Signed by me at Washington, D. C., this 2nd day of November 1907.

TAKAO IWANAMI.

Witnesses:

JOHN B. MCCARTHY, DAISY CROSBY.

